<template>
  <div id="app">
    <h3>案例：折叠面板</h3>
    <div>
      <div class="title">
        <h4>芙蓉楼送辛渐</h4>
        <span class="btn" @click="isOK=!isOK">
          {{isOK ? '收起':'展开'}}
        </span>
      </div>
      <div class="container" v-show="isOK">
        <p>寒雨连江夜入吴,</p>
        <p>平明送客楚山孤。</p>
        <p>洛阳亲友如相问，</p>
        <p>一片冰心在玉壶。</p>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      isOK:true
    }
  }
}
</script>

<style>
 body {
  background-color: #ccc;
 }
  #app {
    width: 400px;
    margin: 20px auto;
    background-color: #fff;
    border: 4px solid blueviolet;
    border-radius: 1em;
    box-shadow: 3px 3px 3px rgba(0, 0, 0, 0.5);
    padding: 1em 2em 2em;
  }
  h3 {
    text-align: center;
  }
  .title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid #ccc;
    padding: 0 1em;
  }
  .title h4 {
    line-height: 2;
    margin: 0;
  }
  .container {
    border: 1px solid #ccc;
    padding: 0 1em;
  }
  .btn {
    /* 鼠标改成手的形状 */
    cursor: pointer;
  }


</style>